using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.ComponentModel;
using System.Windows.Forms.VisualStyles;

namespace WeifenLuo.WinFormsUI.Docking
{
	internal class VS2005AutoHideStrip : AutoHideStripBase
	{
		private class TabVS2005 : Tab
		{
			internal TabVS2005(IDockContent content)
				: base(content)
			{
			}

			private int m_tabX = 0;
			public int TabX
			{
				get { return m_tabX; }
				set { m_tabX = value; }
			}

			private int m_tabWidth = 0;
			public int TabWidth
			{
				get { return m_tabWidth; }
				set { m_tabWidth = value; }
			}

		}

		private const int _ImageHeight = 16;
		private const int _ImageWidth = 16;
		private const int _ImageGapTop = 2;
		private const int _ImageGapLeft = 4;
		private const int _ImageGapRight = 2;
		private const int _ImageGapBottom = 2;
		private const int _TextGapLeft = 0;
		private const int _TextGapRight = 2;
		private const int _TabGapTop = 3;
		private const int _TabGapLeft = 4;
		private const int _TabGapBetween = 10;

		#region Customizable Properties
		private static Font TextFont
		{
			get { return SystemInformation.MenuFont; }
		}

		private static StringFormat _stringFormatTabHorizontal;
		private StringFormat StringFormatTabHorizontal
		{
			get
			{
				if ( _stringFormatTabHorizontal == null ) {
					_stringFormatTabHorizontal = new StringFormat();
					_stringFormatTabHorizontal.Alignment = StringAlignment.Near;
					_stringFormatTabHorizontal.LineAlignment = StringAlignment.Center;
					_stringFormatTabHorizontal.FormatFlags = StringFormatFlags.NoWrap | StringFormatFlags.FitBlackBox;
				}

				if ( RightToLeft == RightToLeft.Yes )
					_stringFormatTabHorizontal.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
				else
					_stringFormatTabHorizontal.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft;

				return _stringFormatTabHorizontal;
			}
		}

		private static StringFormat _stringFormatTabVertical;
		private StringFormat StringFormatTabVertical
		{
			get
			{
				if ( _stringFormatTabVertical == null ) {
					_stringFormatTabVertical = new StringFormat();
					_stringFormatTabVertical.Alignment = StringAlignment.Near;
					_stringFormatTabVertical.LineAlignment = StringAlignment.Center;
					_stringFormatTabVertical.FormatFlags = StringFormatFlags.NoWrap | StringFormatFlags.DirectionVertical;
				}
				if ( RightToLeft == RightToLeft.Yes )
					_stringFormatTabVertical.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
				else
					_stringFormatTabVertical.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft;

				return _stringFormatTabVertical;
			}
		}

		private static int ImageHeight
		{
			get { return _ImageHeight; }
		}

		private static int ImageWidth
		{
			get { return _ImageWidth; }
		}

		private static int ImageGapTop
		{
			get { return _ImageGapTop; }
		}

		private static int ImageGapLeft
		{
			get { return _ImageGapLeft; }
		}

		private static int ImageGapRight
		{
			get { return _ImageGapRight; }
		}

		private static int ImageGapBottom
		{
			get { return _ImageGapBottom; }
		}

		private static int TextGapLeft
		{
			get { return _TextGapLeft; }
		}

		private static int TextGapRight
		{
			get { return _TextGapRight; }
		}

		private static int TabGapTop
		{
			get { return _TabGapTop; }
		}

		private static int TabGapLeft
		{
			get { return _TabGapLeft; }
		}

		private static int TabGapBetween
		{
			get { return _TabGapBetween; }
		}

		private static Brush BrushTabBackground
		{
			get { return SystemBrushes.ControlLightLight; }
		}

		private static Pen PenTabBorder
		{
			get { return SystemPens.GrayText; }
		}

		private static Brush BrushTabText
		{
			get { return SystemBrushes.FromSystemColor(SystemColors.ControlDarkDark); }
		}
		#endregion

		private static Matrix _matrixIdentity = new Matrix();
		private static Matrix MatrixIdentity
		{
			get { return _matrixIdentity; }
		}

		private static DockState[] _dockStates;
		private static DockState[] DockStates
		{
			get
			{
				if ( _dockStates == null ) {
					_dockStates = new DockState[4];
					_dockStates[0] = DockState.DockLeftAutoHide;
					_dockStates[1] = DockState.DockRightAutoHide;
					_dockStates[2] = DockState.DockTopAutoHide;
					_dockStates[3] = DockState.DockBottomAutoHide;
				}
				return _dockStates;
			}
		}

		private static GraphicsPath _graphicsPath;
		internal static GraphicsPath GraphicsPath
		{
			get
			{
				if ( _graphicsPath == null )
					_graphicsPath = new GraphicsPath();

				return _graphicsPath;
			}
		}

		public VS2005AutoHideStrip(DockPanel panel)
			: base(panel)
		{
			SetStyle(ControlStyles.ResizeRedraw |
				ControlStyles.UserPaint |
				ControlStyles.AllPaintingInWmPaint |
				ControlStyles.OptimizedDoubleBuffer, true);
			BackColor = SystemColors.ControlLight;
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			if ( this.TopLevelControl == null ) return;
			Point ptLeft = this.PointToClient(this.TopLevelControl.PointToScreen(new Point(0, 0)));
			using ( LinearGradientBrush brush = new LinearGradientBrush(
				new Point(ptLeft.X, 0), new Point(ptLeft.X + this.TopLevelControl.Width, 0),
				DrawHelper.ProfessionalColors.ToolStripContentPanelGradientBegin,
				DrawHelper.ProfessionalColors.ToolStripContentPanelGradientEnd) ) {
				Rectangle r = Rectangle.Intersect(e.ClipRectangle, this.ClientRectangle);
				e.Graphics.FillRectangle(brush, r);
			}
			Graphics g = e.Graphics;
			DrawTabStrip(g);
		}

		protected override void OnLayout(LayoutEventArgs levent)
		{
			CalculateTabs();
			base.OnLayout(levent);
		}

		private void DrawTabStrip(Graphics g)
		{
			DrawTabStrip(g, DockState.DockTopAutoHide);
			DrawTabStrip(g, DockState.DockBottomAutoHide);
			DrawTabStrip(g, DockState.DockLeftAutoHide);
			DrawTabStrip(g, DockState.DockRightAutoHide);
		}

		private void DrawTabStrip(Graphics g, DockState dockState)
		{
			Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

			if ( rectTabStrip.IsEmpty )
				return;

			Matrix matrixIdentity = g.Transform;
			if ( dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide ) {
				Matrix matrixRotated = new Matrix();
				matrixRotated.RotateAt(90, new PointF((float)rectTabStrip.X + (float)rectTabStrip.Height / 2,
					(float)rectTabStrip.Y + (float)rectTabStrip.Height / 2));
				g.Transform = matrixRotated;
			}

			foreach ( Pane pane in GetPanes(dockState) ) {
				foreach ( TabVS2005 tab in pane.AutoHideTabs )
					DrawTab(g, tab);
			}
			g.Transform = matrixIdentity;
		}

		private void CalculateTabs()
		{
			CalculateTabs(DockState.DockTopAutoHide);
			CalculateTabs(DockState.DockBottomAutoHide);
			CalculateTabs(DockState.DockLeftAutoHide);
			CalculateTabs(DockState.DockRightAutoHide);
		}

		private void CalculateTabs(DockState dockState)
		{
			Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

			int imageHeight = rectTabStrip.Height - ImageGapTop - ImageGapBottom;
			int imageWidth = ImageWidth;
			if ( imageHeight > ImageHeight )
				imageWidth = ImageWidth * ( imageHeight / ImageHeight );

			int x = TabGapLeft + rectTabStrip.X;
			foreach ( Pane pane in GetPanes(dockState) ) {
				foreach ( TabVS2005 tab in pane.AutoHideTabs ) {
					int width = imageWidth + ImageGapLeft + ImageGapRight +
						TextRenderer.MeasureText(tab.Content.DockHandler.TabText, TextFont).Width +
						TextGapLeft + TextGapRight;
					tab.TabX = x;
					tab.TabWidth = width;
					x += width;
				}

				x += TabGapBetween;
			}
		}

		private Rectangle RtlTransform(Rectangle rect, DockState dockState)
		{
			Rectangle rectTransformed;
			if ( dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide )
				rectTransformed = rect;
			else
				rectTransformed = DrawHelper.RtlTransform(this, rect);

			return rectTransformed;
		}

		private GraphicsPath GetTabOutline(TabVS2005 tab, bool transformed, bool rtlTransform)
		{
			DockState dockState = tab.Content.DockHandler.DockState;
			Rectangle rectTab = GetTabRectangle(tab, transformed);
			if ( rtlTransform )
				rectTab = RtlTransform(rectTab, dockState);
			bool upTab = ( dockState == DockState.DockLeftAutoHide || dockState == DockState.DockBottomAutoHide );
			DrawHelper.GetRoundedCornerTab(GraphicsPath, rectTab, upTab);

			return GraphicsPath;
		}

		private void DrawTab(Graphics g, TabVS2005 tab)
		{
			Rectangle rectTabOrigin = GetTabRectangle(tab);
			if ( rectTabOrigin.IsEmpty )
				return;

			DockState dockState = tab.Content.DockHandler.DockState;
			IDockContent content = tab.Content;

			if ( Application.RenderWithVisualStyles ) {
				Rectangle rectTab = GetTabRectangle(tab, true);
				rectTab = RtlTransform(rectTab, dockState);
				bool lrTab = ( dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide );
				if ( lrTab ) rectTab.Height++; else rectTab.Width++;
				using ( Bitmap bmp = new Bitmap(lrTab ? rectTab.Height : rectTab.Width,
												lrTab ? rectTab.Width : rectTab.Height) )
				using ( Graphics bmpg = Graphics.FromImage(bmp) ) {
					VisualStyleElement element = VisualStyleElement.Tab.TopTabItem.Normal;
					if ( DockPanel.ActiveAutoHideContent == content ) element = VisualStyleElement.Tab.TopTabItem.Hot;
					VisualStyleRenderer vsr = new VisualStyleRenderer(element);
					vsr.DrawBackground(bmpg, new Rectangle(0, 0,
						lrTab ? rectTab.Height : rectTab.Width, lrTab ? rectTab.Width : rectTab.Height));
					switch ( dockState ) {
						case DockState.DockTopAutoHide:
							bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
							break;
						case DockState.DockLeftAutoHide:
							bmp.RotateFlip(RotateFlipType.Rotate90FlipNone);
							break;
						case DockState.DockRightAutoHide:
							bmp.RotateFlip(RotateFlipType.Rotate270FlipNone);
							break;
					}
					Matrix mr = g.Transform;
					g.Transform = MatrixIdentity;
					g.DrawImageUnscaled(bmp, rectTab);
					g.Transform = mr;
				}
			} else {
				GraphicsPath path = GetTabOutline(tab, false, true);
				g.FillPath(BrushTabBackground, path);
				g.DrawPath(PenTabBorder, path);
			}
			// Set no rotate for drawing icon and text
			Matrix matrixRotate = g.Transform;
			g.Transform = MatrixIdentity;

			// Draw the icon
			Rectangle rectImage = rectTabOrigin;
			rectImage.X += ImageGapLeft;
			rectImage.Y += ImageGapTop;
			int imageHeight = rectTabOrigin.Height - ImageGapTop - ImageGapBottom;
			int imageWidth = ImageWidth;
			if ( imageHeight > ImageHeight )
				imageWidth = ImageWidth * ( imageHeight / ImageHeight );
			rectImage.Height = imageHeight;
			rectImage.Width = imageWidth;
			rectImage = GetTransformedRectangle(dockState, rectImage);
			g.DrawIcon(( (Form)content ).Icon, RtlTransform(rectImage, dockState));

			// Draw the text
			Rectangle rectText = rectTabOrigin;
			rectText.X += ImageGapLeft + imageWidth + ImageGapRight + TextGapLeft;
			rectText.Width -= ImageGapLeft + imageWidth + ImageGapRight + TextGapLeft;
			rectText = RtlTransform(GetTransformedRectangle(dockState, rectText), dockState);
			if ( dockState == DockState.DockLeftAutoHide || dockState == DockState.DockRightAutoHide )
				g.DrawString(content.DockHandler.TabText, TextFont, BrushTabText, rectText, StringFormatTabVertical);
			else
				g.DrawString(content.DockHandler.TabText, TextFont, BrushTabText, rectText, StringFormatTabHorizontal);

			// Set rotate back
			g.Transform = matrixRotate;
		}

		private Rectangle GetLogicalTabStripRectangle(DockState dockState)
		{
			return GetLogicalTabStripRectangle(dockState, false);
		}

		private Rectangle GetLogicalTabStripRectangle(DockState dockState, bool transformed)
		{
			if ( !DockHelper.IsDockStateAutoHide(dockState) )
				return Rectangle.Empty;

			int leftPanes = GetPanes(DockState.DockLeftAutoHide).Count;
			int rightPanes = GetPanes(DockState.DockRightAutoHide).Count;
			int topPanes = GetPanes(DockState.DockTopAutoHide).Count;
			int bottomPanes = GetPanes(DockState.DockBottomAutoHide).Count;

			int x, y, width, height;

			height = MeasureHeight();
			if ( dockState == DockState.DockLeftAutoHide && leftPanes > 0 ) {
				x = 0;
				y = ( topPanes == 0 ) ? 0 : height;
				width = Height - ( topPanes == 0 ? 0 : height ) - ( bottomPanes == 0 ? 0 : height );
			} else if ( dockState == DockState.DockRightAutoHide && rightPanes > 0 ) {
				x = Width - height;
				if ( leftPanes != 0 && x < height )
					x = height;
				y = ( topPanes == 0 ) ? 0 : height;
				width = Height - ( topPanes == 0 ? 0 : height ) - ( bottomPanes == 0 ? 0 : height );
			} else if ( dockState == DockState.DockTopAutoHide && topPanes > 0 ) {
				x = leftPanes == 0 ? 0 : height;
				y = 0;
				width = Width - ( leftPanes == 0 ? 0 : height ) - ( rightPanes == 0 ? 0 : height );
			} else if ( dockState == DockState.DockBottomAutoHide && bottomPanes > 0 ) {
				x = leftPanes == 0 ? 0 : height;
				y = Height - height;
				if ( topPanes != 0 && y < height )
					y = height;
				width = Width - ( leftPanes == 0 ? 0 : height ) - ( rightPanes == 0 ? 0 : height );
			} else
				return Rectangle.Empty;

			if ( !transformed )
				return new Rectangle(x, y, width, height);
			else
				return GetTransformedRectangle(dockState, new Rectangle(x, y, width, height));
		}

		private Rectangle GetTabRectangle(TabVS2005 tab)
		{
			return GetTabRectangle(tab, false);
		}

		private Rectangle GetTabRectangle(TabVS2005 tab, bool transformed)
		{
			DockState dockState = tab.Content.DockHandler.DockState;
			Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);

			if ( rectTabStrip.IsEmpty )
				return Rectangle.Empty;

			int x = tab.TabX;
			int y = rectTabStrip.Y +
				( dockState == DockState.DockTopAutoHide || dockState == DockState.DockRightAutoHide ?
				0 : TabGapTop );
			int width = tab.TabWidth;
			int height = rectTabStrip.Height - TabGapTop;

			if ( !transformed )
				return new Rectangle(x, y, width, height);
			else
				return GetTransformedRectangle(dockState, new Rectangle(x, y, width, height));
		}

		private Rectangle GetTransformedRectangle(DockState dockState, Rectangle rect)
		{
			if ( dockState != DockState.DockLeftAutoHide && dockState != DockState.DockRightAutoHide )
				return rect;

			PointF[] pts = new PointF[1];
			// the center of the rectangle
			pts[0].X = (float)rect.X + (float)rect.Width / 2;
			pts[0].Y = (float)rect.Y + (float)rect.Height / 2;
			Rectangle rectTabStrip = GetLogicalTabStripRectangle(dockState);
			Matrix matrix = new Matrix();
			matrix.RotateAt(90, new PointF((float)rectTabStrip.X + (float)rectTabStrip.Height / 2,
				(float)rectTabStrip.Y + (float)rectTabStrip.Height / 2));
			matrix.TransformPoints(pts);

			return new Rectangle((int)( pts[0].X - (float)rect.Height / 2 + .5F ),
				(int)( pts[0].Y - (float)rect.Width / 2 + .5F ),
				rect.Height, rect.Width);
		}

		protected override IDockContent HitTest(Point ptMouse)
		{
			foreach ( DockState state in DockStates ) {
				Rectangle rectTabStrip = GetLogicalTabStripRectangle(state, true);
				if ( !rectTabStrip.Contains(ptMouse) )
					continue;

				foreach ( Pane pane in GetPanes(state) ) {
					DockState dockState = pane.DockPane.DockState;
					foreach ( TabVS2005 tab in pane.AutoHideTabs ) {
						GraphicsPath path = GetTabOutline(tab, true, true);
						if ( path.IsVisible(ptMouse) )
							return tab.Content;
					}
				}
			}

			return null;
		}

		protected internal override int MeasureHeight()
		{
			return Math.Max(ImageGapBottom +
				ImageGapTop + ImageHeight,
				TextFont.Height) + TabGapTop;
		}

		protected override void OnRefreshChanges()
		{
			CalculateTabs();
			Invalidate();
		}

		protected override AutoHideStripBase.Tab CreateTab(IDockContent content)
		{
			return new TabVS2005(content);
		}
	}
}
